JP4707901B2 - Forensic adhesive sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-sensitive adhesive sheet for identification. Specifically, the present invention relates to a pressure-sensitive adhesive sheet for identification used for collecting fingerprints, footprints, tire marks, and the like.
[0002]
[Prior art]
As a pressure-sensitive adhesive sheet for collecting fingerprints and footprints, for example, a transparent support film coated with a urethane-based pressure-sensitive adhesive is disclosed in Japanese Patent Application Laid-Open No. 2001-40299.
[0003]
In order to collect fingerprints using this adhesive sheet, first apply the powder to the surface to be collected little by little with a brush, etc. Lift up. Next, the backing sheet that also serves as the release paper is peeled off from one end of the adhesive sheet, the adhesive surface is brought into contact with the surface to be collected, and the fingerprint that has been lifted while peeling the backing paper is completely transferred to the adhesive surface, and then the backing paper is again Affix to the adhesive surface. Then, when collecting on the mount, fill in the necessary information such as the collection location and complete fingerprint collection.
[0004]
However, the mount can be easily peeled off and reattached from the adhesive sheet, and the adhesive sheet or the mount can be intentionally pasted during storage. In addition, the backing sheet may be peeled off naturally from the adhesive sheet, and the adhesive sheet and the backing sheet may be confused.
[0005]
At this time, the mount and the adhesive sheet may be fixed with a stapler or the like, but in this case as well, the adhesive sheet or the mount can be replaced by aligning the needle holes of the stapler needle. In addition, when both are fixed with another fixing tape with the backing sheet and adhesive sheet bonded together, the fixing sheet is peeled off at a low speed, or the adhesive is softened and peeled off using a heat source such as a dryer. Therefore, it is difficult to prove that the backing sheet and the adhesive sheet are used in the same manner without damaging the surface of the backing sheet, and the peeled adhesive sheet can be peeled in a re-applicable state. There was a case.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the prior art, and after collecting fingerprints, footprints, etc., by making it possible to immediately determine that the mount has been peeled off and reattached, The purpose is to enhance the evidence capacity of the sheet.
[0007]
The pressure-sensitive adhesive sheet for identification according to the present invention comprises a pressure-sensitive adhesive sheet main body comprising a pressure-sensitive adhesive sheet layer having a pressure-sensitive adhesive layer on one side of a support and a backing layer that is re-stickable to the pressure-sensitive adhesive layer, A pressure sensitive adhesive sheet for discrimination comprising a pressure sensitive adhesive tape for peeling discrimination for adhering and fixing the pressure sensitive adhesive sheet layer and the backing layer in a state of being bonded together, wherein the pressure sensitive adhesive tape for peeling discrimination is a pressure sensitive adhesive sheet main body for flaw detection In any one of the peripheral edges, a mountain fold is attached so as to sandwich the mount layer and the adhesive sheet layer .
[0008]
At this time, as the pressure-sensitive adhesive tape for peeling determination, the peeling is performed using a tape provided with a coating layer formed on the entire surface or a part of the support and a pressure-sensitive adhesive layer covering the coating layer on one side of the support. When the discrimination adhesive tape is peeled off from the identification adhesive sheet main body, the film layer and / or the adhesive layer may be peeled off from the support of the peel discrimination adhesive tape.
[0009]
Further, the coating layer is composed of a release agent layer formed on the entire surface or a part of the support and a printing layer formed on the release agent layer, and at least the printing layer is an adhesive tape for determination of peeling. It can be made to peel from the support body.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic configuration diagram showing a forensic adhesive sheet according to an embodiment of the present invention, in which FIG. 1 (a) is a side view, FIG. 2 (b) is a plan view, and FIG. It is a block diagram which shows the adhesive tape for peeling discrimination used for an adhesive sheet. Hereinafter, the present invention will be described in detail with reference to the drawings.
[0011]
The pressure-sensitive adhesive sheet for identification according to the present invention comprises a pressure-sensitive adhesive sheet body 1 for collecting fingerprints, footprints, tire marks, and the like, and a pressure-sensitive adhesive sheet layer 10 and a mount layer 11 constituting the pressure-sensitive adhesive sheet body 1 for identification. It is provided with a peeling discrimination adhesive tape 2 for adhering and fixing both in a bonded state. The pressure-sensitive adhesive sheet layer 10 has, for example, a pressure-sensitive pressure-sensitive adhesive layer 13 formed on any one surface of a transparent support film 12, and transfers a fingerprint or the like lifted from the surface to be collected. The backing layer 11 is pasted to the adhesive sheet layer 10 so that it can be re-applied, and a cover layer 14 having a case number entry column, a collection date and time entry column, a witness name entry column, etc. printed on the surface and the back side of the cover layer 14 It is comprised from the peelable black or white plastic film 15 bonded together. In this mount layer 11, a plastic film 15 is attached to the adhesive layer 13 of the adhesive sheet layer 10.
[0012]
This forensic pressure sensitive adhesive sheet body 1 includes an adhesive sheet layer 10 such as the forensic pressure sensitive adhesive sheet described in JP-A-2001-40299 and the forensic pressure-sensitive adhesive sheet described in JP-A-3-80833. Any adhesive layer (fingerprint transfer surface) 13 constituting the adhesive sheet layer 10 may be used as long as it is provided with a mount layer 11 that can be peeled off and reattached. That is, as long as it can be used for the pressure-sensitive adhesive sheet layer 10 for collecting and storing fingerprints and footprints, any material can be used for the pressure-sensitive adhesive and the support film 12 and the above-described purpose can be achieved. Any material may be used for the plastic film 15, the cover layer 14, and the like. Specifically, those disclosed in the above publication are used.
[0013]
Next, the peeling discrimination adhesive tape 2 makes it easy to check whether the identification adhesive sheet main body 1 is abnormal, in other words, whether the mount layer 11 or the adhesive sheet layer 10 has been intentionally or accidentally changed after fingerprint collection. The adhesive sheet body 1 for inspection is attached to the back side from the front side to the back side. Specifically, the peeling discrimination adhesive tape 2 cut to a certain length is folded and stuck along the periphery of the identification adhesive sheet main body 1 so as to sandwich the mount layer 11 and the adhesive tape layer 10. Thus, the support film 12 of the adhesive tape layer 10 and the plastic film 15 of the mount layer 11 are fixed. As shown in FIG. 1 (b), the peeling discrimination adhesive tape 2 is generally adhered with the longitudinal direction of the tape 2 along the peripheral edge of the identification adhesive sheet main body 1, and is applied at any one of the peripheral edges. Worn. By doing so, the mount layer 11 can be peeled from the side opposite to the sticking side, and a fingerprint or the like can be collected without the mount layer 11 and the adhesive sheet layer 10 being separated.
[0014]
The peeling discrimination adhesive tape 2 has a function of visually confirming whether or not the adhesive tape once attached to the adherend has been peeled off from the adherend by various forms of the adhesive tape. If there is, it can be used without any particular limitation. As such an adhesive tape 2 for peel discrimination, for example, “Rob Sensor Tape (registered trademark of Nitto Denko Corporation)” sold by Nitto Denko Corporation can be used.
[0015]
As a specific configuration of the peeling discrimination pressure-sensitive adhesive tape 2, for example, a coating layer 21 formed on the entire surface or a part thereof on one side of a tape-like or sheet-like support 20 and the coating layer 21 are provided. A pressure-sensitive adhesive layer 22 is provided, and the adhesive force between the film layer 21 and the support 20 is such that the film layer 21 is peeled from the support 20 when peeled from the adherend. What was made smaller than the adhesive force between the bodies is mentioned.
[0016]
In the example shown in FIG. 2, the coating layer 21 is formed on the entire surface of one side of the support 20 and partially on the release agent layer 21 a, for example, in a stripe shape, a spot shape, a lattice shape, or the like. The adhesive layer 22 is provided so as to cover the coating layer 21.
[0017]
The release agent layer 21a adheres favorably to the support 20, for example, but the adhesive force between the release layer 21a and the printing layer 21b is adjusted to be smaller than that. Moreover, the adhesive force between the printing layer 21b and the release agent layer 21a is the adhesive force between the support film 12 constituting the pressure-sensitive adhesive sheet layer 10 and the pressure-sensitive adhesive layer 22, and the mount layer 11 and the pressure-sensitive adhesive layer 22. It adjusts so that it may become smaller than the adhesive force between. As a result, when the peelable adhesive tape 2 is peeled from the mount layer 11 (or the adhesive sheet layer 10), the printed layer 21b of the peelable adhesive tape 2 is peeled off from the release agent layer 21a (support 20). The printed layer 21b falls off from the peelable adhesive tape 2 after being peeled off and remains on the peeled mount layer 11 (or the adhesive sheet layer 10), and the adhesive layer 22 is peeled off from the support 20, and the adhesive strength thereof is descend. That is, in this example, the release agent layer 21 a adjusts the adhesive force between the printing layer 21 b and the support 20, and only the printing layer 21 b is peeled off as the coating layer 21.
[0018]
Moreover, as for the adhesive tape 2 for peeling discrimination | determination, the membrane | film | coat layer 21 peels from the adhesive layer 22 with the support body 20, and the adhesive layer 22 peels from the support body 20, and it is a to-be-adhered body (mounting layer 11 or adhesive sheet layer 10). The structure may remain in For example, the coating layer 21 made of the release agent layer 21 a may be formed on the entire surface or a part of the support 20, and the adhesive layer 22 may be provided so as to cover the coating layer 21. In this case, the adhesive force between the coating layer 21 and the support 20 is greater than the adhesive force between the adhesive layer 22 and the adherend, and the adhesive layer 22 remains on the adherend. Further, a part of the pressure-sensitive adhesive layer 22 may be peeled off from the adherend together with the support 20.
[0019]
The peel-off determination adhesive tape 2 is not limited in its configuration as long as the peel-off from the adherend can be discriminated by peeling off the coating layer 21 and / or the pressure-sensitive adhesive layer 22 from the support 20 as described above. In the case of the structure shown in FIG. 2, the release agent layer 21a adheres favorably to the print layer 21b, but the adhesive force between the release agent layer 21a and the support 20 may be adjusted to be smaller than that. In this case, the printing layer 21b and the release agent layer 21a are integrated into the film layer 21, and the print layer 21b is peeled off from the support 20 together with the release agent layer 21a.
[0020]
In addition, the print layer 21b is not only partially configured on the release agent layer 21a, but the print layer 21b is configured on the entire surface, or a part thereof is placed on the release agent layer 21a. In addition, the printing layer 21b may be configured directly or partially on the entire support 20. In this way, any structure may be used as long as the coating layer 21b and the coating layer 21 including the release agent layer 21a are peeled off. Further, the coating layer 21 can be made of not only the printing layer 21a made of ink or paint, but also other resin layers, and preferably a material that can be visually confirmed.
[0021]
As such a peeling discrimination adhesive tape 2, for example, those described in Japanese Utility Model Publication No. 52-38612, Japanese Utility Model Publication No. 54-8120, Japanese Utility Model Publication No. 56-18881, and the like can be used. In what is described in Japanese Utility Model Publication No. 52-38612, the coating layer 21 is made of a sheet-like material such as an ethylene-vinyl acetate copolymer, a resin, paint, ink, or the like, and is formed on the entire surface of the support 20. Has been. In addition, in those described in Japanese Utility Model Publication No. 54-8120 and Japanese Utility Model Publication No. 56-18581, a part of one side of the support 20 is a copolymer of octadecyl acrylate and acrylic acid, vinyl stearate and anhydrous. A thin film layer made of a copolymer with maleic acid, an ethylene-vinyl acetate copolymer resin, or the like is formed, and a partially printed layer having a part thereof placed on the surface of the thin film layer is provided to form a film layer 21. ing.
[0022]
As a result, when the peeling discrimination adhesive tape 2 is peeled from the mount layer 11 (or the adhesive sheet layer 10), the mount layer 11 from which the film layer 21 and / or the adhesive layer 22 of the peel discrimination adhesive tape 2 is peeled off. (Or the pressure-sensitive adhesive sheet layer 10), and the coating layer 21 and / or the pressure-sensitive adhesive layer 22 fall off from the pressure-sensitive adhesive tape 2 for peeling discrimination after being peeled off, and the adhesive strength thereof is reduced. Therefore, even if another backing paper layer 11 (or adhesive sheet layer 10) is reapplied, it is difficult to re-fix with the same adhesive tape 2 for peel discrimination. Further, since the film layer 21 and / or the pressure-sensitive adhesive layer 22 remain on the backing paper layer 11 (or the pressure-sensitive adhesive sheet layer 10) from which the pressure-sensitive adhesive tape 2 for peeling discrimination has been peeled off, this is replaced with another pressure-sensitive adhesive sheet layer 10 (or the paper backing layer). Even if it is reapplied to 11), since the traces by the film layer 21 and / or the adhesive layer 22 remain, it can be immediately recognized that the mount layer 11 has been reapplied.
[0023]
In this way, in the pressure-sensitive adhesive sheet for identification of the present invention, when the backing layer 11 or the pressure-sensitive adhesive sheet layer 10 is to be pasted, the pressure-sensitive adhesive tape 2 for peeling determination must be peeled off, and the pressure-sensitive adhesive tape for peeling determination 2 If it is peeled off, it will be proved reliably and the ability as evidence will be improved. Moreover, since the backing paper layer 11 and the pressure sensitive adhesive sheet layer 10 are stuck and fixed by the pressure sensitive adhesive tape 2 for peeling discrimination, both do not fall apart and can contribute to prevention of peeling during storage. In particular, by using the printing layer 21b for the coating layer 21, the visibility is improved, and the determination can be made in an instant.
[0024]
【Example】
Next, the present invention will be further described based on the following examples. Of course, it goes without saying that the present invention is not limited to the following examples.
[0025]
(1) Preparation of the pressure-sensitive adhesive sheet for identification use 9.5% by weight of a crosslinking agent in a 85% by weight toluene solution of a polyether polyurethane pressure-sensitive adhesive using propylene glycol as a polyol and HDI (hexamethylene diisocyanate) as a crosslinking agent % Was added on a polyethylene terephthalate film and cured under conditions of 140 ° C. × 5 minutes to obtain a pressure-sensitive adhesive sheet layer in which a thermosetting urethane-based pressure-sensitive adhesive layer having a thickness of 100 μm was formed. . An adhesive sheet main body for identification is prepared by attaching a backing layer in which high-quality paper is laminated on a black propylene film (size: 150 mm × 150 mm) having a critical surface tension of 35 dyne / cm and a thickness of 50 μm to the adhesive layer surface of the adhesive sheet layer. did.
[0026]
(2) Production of adhesive tape for peel discrimination A polyethylene terephthalate film (20 mm wide) with a thickness of 38 μm diluted with toluene with a long-chain alkyl release agent (trade name “Pyroyl 1010”, manufactured by Yushi Kogyo Co., Ltd.) The release agent layer was formed on the entire surface of the film by coating and drying, and a spotted print layer was formed thereon. Next, a rubber-based adhesive (Quintac 3433 (manufactured by ZEON Corporation)) 50% by weight, Quinton N-295 (manufactured by ZEON Corporation) 35% by weight, YS Resin TO -L (made by Yasuhara Chemical Co., Ltd., 15% by weight) was applied so as to have a thickness of 30 μm to produce an adhesive tape for peel discrimination.
[0027]
Next, the adhesive tape for peel discrimination is set in the longitudinal direction with respect to the periphery of the adhesive sheet main body for identification, and is attached to the front and back of the adhesive sheet main body for identification as shown in FIG. It was.
[0028]
When this identification adhesive tape was subjected to an unsealing test to peel off the peeling identification adhesive tape, the printed layer remained on the identification adhesive sheet together with the adhesive layer, and the initial purpose could be achieved. On the other hand, when a similar test was performed by producing a peeling discrimination pressure-sensitive adhesive tape without forming a release agent layer as a comparative example, the printed layer did not remain on the identification pressure-sensitive adhesive sheet, and the initial purpose could not be achieved.
[0029]
For reference, an adhesive tape for peeling discrimination cut to a width of 20 mm with a 2 kg heavy roller is reciprocated once on a stainless steel plate, and after 30 minutes of standing, the adhesive strength is 180 mm in direction with a tensile speed of 300 mm / min. Was measured to be 0.5 N / 20 mm (the printed layer and the pressure-sensitive adhesive layer remained on the stainless steel plate) in the peeling discrimination adhesive tape of the example, and 20 N / 20 mm in the comparative example.
[0030]
【The invention's effect】
According to the present invention, the adhesive sheet layer for collecting fingerprints and the mount layer laminated so as to be re-applied to the adhesive sheet layer are adhered and fixed by the adhesive tape for separation determination in a state of being adhered, When the peeling discrimination adhesive tape is peeled off, a coating layer constituting the peeling discrimination adhesive tape, for example, a printing layer, remains on the adhesive sheet layer or mount layer together with the adhesive layer. Therefore, it is clearly known that the peel-off determination adhesive tape has been peeled off from the identification adhesive sheet main body, and it is clearly understood that the adhesive sheet layer or the mount layer has been changed. In this way, the ability as evidence is enhanced. Moreover, peeling at the time of storage can be avoided, and the adhesive sheet layer and the mount layer can be prevented from being separated at the time of collection.
[Brief description of the drawings]
1A and 1B are schematic configuration diagrams showing an identification pressure-sensitive adhesive sheet according to an embodiment of the present invention, in which FIG. 1A is a side view thereof, and FIG. 1B is a plan view thereof.
FIG. 2 is a configuration diagram showing a peeling discrimination adhesive tape used for the identification adhesive sheet shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Adhesive sheet body for identification 2 Adhesive tape 10 for peeling discrimination Adhesive sheet layer 11 Mount layer 12 Support film 13 Adhesive layer 15 Plastic film 20 Support body 21 Coating layer 21a Release agent layer 21b Print layer 22 Adhesive layer

Claims (3)

A pressure-sensitive adhesive sheet body for identification comprising a pressure-sensitive adhesive sheet layer having a pressure-sensitive adhesive layer on one side of a support, and a backing layer bonded to the pressure-sensitive adhesive layer in a re-stickable manner, and the pressure-sensitive adhesive sheet layer and the backing layer It is a pressure-sensitive adhesive sheet for identification provided with a pressure-sensitive adhesive tape for separating and sticking both in a bonded state ,
The adhesive pressure-sensitive adhesive sheet is characterized in that the peel-off adhesive tape is attached in a mountain-folded manner so as to sandwich the backing layer and the adhesive sheet layer at any one of the peripheral edges of the sensitive adhesive sheet body .   The peeling discrimination adhesive tape is provided with a coating layer formed on the entire surface or a part of the support and an adhesive layer covering the coating layer on one side of the support, and the peeling discrimination adhesive tape is used as an identification adhesive. 2. The identification adhesive sheet according to claim 1, wherein, when peeled from the sheet main body, the coating layer and / or the adhesive layer is peeled off from a support of a peel discrimination adhesive tape.   The coating layer is composed of a release agent layer formed on the entire surface or a part of the support and a print layer formed on the release agent layer, and at least the print layer is peeled off from the support of the adhesive tape for release determination. The identification adhesive sheet according to claim 2, wherein the adhesive sheet is for identification.

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